I talked to a founder who is focused on just building his company.
No personal investments.
No rolling funds.
No scout checks.
No personal brand building.
Only working on his company.
Like a psychopath.
If you want to start a startup, it's good to know about multiple, unrelated things. Startups often depend on 4 or 5 different kinds of knowledge, and it's great if they can all be found in 2 founders.